30 mins before the 2008 Sichuan earthquake in China

Bizarre colorful (luminous/glowing) cloud phenomenon in the sky was observed about 30 mins before the May 12, 2008 Sichuan earthquake took place. This was recorded in Tianshui, Gansu province ~450km northeast of epicenter, by someone using a cell phone. source: (Note: People in China do not have direct access to youtube. It was unknown who filmed or uploaded it based on the description in Chinese sites. I only attempted to provide the geographical relationship betwee